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PXI 5646R : Phase coherent

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Hi NI guys !

I'm trying to generate two sine waves with two PXI 5646R modules with the same frequency. It's pretty easy with the library Ni-RFSG. However, now, i need to have the same phase with my two signals. In some documents, I read it was possible to do this by hardware (didn't try yet) and by software.  So, I use the "niRFSG Configure Ref Clock" to have the same time-base. But when I use a scope to see my two signals, I can see that they don't have the same phase. There is a constant gap phase and this gap phase is not the same when a restart the program.

 

Is that possible to have the same phase when I launch the program without doing a loop or modify the phase of one signal without hand-control ?

 

Regards,

 

Fabien


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